时间:2019-01-22 作者:英语课 分类:自然百科2011年


英语课

 Earth's magnetic field has reversed thousands of times since its formation 4.5 billion years ago. And scientists now believe that the next reversal is imminent 1. The race is on to predicting exactly when it will occur. In 2010, the European Space Agency will launch SWARM 2. Its mission is to generate accurate, up-to-the-minute maps of the Earth's magnetosphere and anticipate its future activity. Professor Nils Olsen of the Danish National Space Center is working on the mission. 


 
 
 
“Then you’ve had exciting idea behind SWARM is that we have three satellites. We have higher satellite at an altitude of 530 kilometers and we have a pair of satellites at an altitude of about 400 kilometers.”
 
 
 
These identical satellites are equipped with new generation magnetometers. These will detect minute variations and field strength as well as identifying any new areas where the poles are reversing. 
 
 
 
“I think it's amazing that we can take magnetic measurements by the satellites flying at a few hundred kilometers, and say something about the deepness into the earth how the molten iron moves at a depth of about 3,000 kilometers. Is that amazing?” 
 
 
 
Scientists hope these satellites will help them predict when the magnetic poles are about to switch. They might even save lives. 
 
 
 
“I think that in the next decade or two, we can develop a science to forecast where the Earth's magnetic field is headed, and use that then as a planning tool; use that as a planning tool for people who fly satellites; as a planning tool for people who fly manned spaceflight and develop the technologies necessary to deal with, but say, an impending 3 reversal.”
 

adj.即将发生的,临近的,逼近的
  • The black clounds show that a storm is imminent.乌云预示暴风雨即将来临。
  • The country is in imminent danger.国难当头。
n.(昆虫)等一大群;vi.成群飞舞;蜂拥而入
  • There is a swarm of bees in the tree.这树上有一窝蜜蜂。
  • A swarm of ants are moving busily.一群蚂蚁正在忙碌地搬家。
a.imminent, about to come or happen
  • Against a background of impending famine, heavy fighting took place. 即将发生饥荒之时,严重的战乱爆发了。
  • The king convoke parliament to cope with the impending danger. 国王召开国会以应付迫近眉睫的危险。
学英语单词
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5'-Deoxyadenosyl-B12
acid fast red
Aegerita
albumin milk
almeida pilosa
amoralists
amphoteric ion-exchangeresin
anti-impact gear
batouti
blast furnace smelting
bunss
cabinetmaker
cauliflora
CD Video
Churumuco
COBOL transaction program
collapsible keel block
corecipients
dihydropyrimidinase
direct exporttrade
draw-
drip-drying
escrowing
esterifiable
Ethydan
ethyl cyanamide
filtered signal
fire bricks
flamdoodle
Florence crystals
foam solution
folded potential
forestry production statistics
fully arisen sea
general fixed assets group of accounts
genus Hamamelis
genus irenas
Grecian nose
groaners
Guengant
Haskins
hcb
ill-humo(u)redly
in conjunction with
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inseminating catheter
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joint buying office
Kentish fire
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Lincolnshire
look-at-me signal
magon
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Muncimir
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not the done thing
nuclei cochleares
Oetinghausen
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Pelargonium limoneum
pen lid
penetration method
permeably
Ping Pong buffer
powerful radio-frequency cable
pump for sludge tank
punctuation space
Quinalspan
redalder
reduced flange
regulating error
requirement for tax exemption
self-skill
shape straighten
shelf front
ST_including-and-excluding_covering-and-adding-layers
suele
taper-reamer
taste acuity
technico-
telecommunication route
throw up one's hat
transiliac
travel card
triatic
uncountry
variation in testing temperature
vibroplatform
Villaputzu
Virtual File Allocation Table
vision distance
well-illuminated
what are we waiting for
yester-morrows
z transform inverse